Watch Mainspring Winder

Watch mainspring winder. The STL files are for a 9mm barrel and 3mm arbor. You can change the shape with the openscad file to suit whatever you need. Likely could even be used for clocks if you wanted to.

In order to use the winder, you'll need to drill a small hole in the arbor and put a wire in it to catch the end of the mainspring.

Put the plunger in the handle and then place the mainspring on the winder, put the handle onto the winder and start turning.